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ella [17]
4 years ago
15

How do you make cupcakes

Physics
1 answer:
expeople1 [14]4 years ago
8 0
Just read the back of the cake box
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How do I answer number 4? Please help x
4vir4ik [10]

Explanation:

Efficiency is the ratio of energy out to energy in.

e = Eout / Ein

0.52 = 800 J / Ein

Ein ≈ 1538 J

Round as needed.

8 0
3 years ago
The unified atomic mass unit is defined to be 1 u = 1.6605 ✕ 10−27 kg. Verify that this amount of mass converted to energy yield
katen-ka-za [31]

Answer: The energy yield is 931.5MeV

Explanation: Please see the attachments below

8 0
3 years ago
Read 2 more answers
For the PE formula, why is the height required for calculations? Why do we need to know the height in order to determine PE? *
Fudgin [204]

Answer:

Answer in Explanation

Explanation:

Whenever we talk about the gravitational potential energy, it means the energy stored in a body due to its position in the gravitational field. Now, we know that in the gravitational field the work is only done when the body moves vertically. If the body moves horizontally on the same surface in the Earth's Gravitational Field, then the work done on the body is considered to be zero. Hence, the work done or the energy stored in the object while in the gravitational field is only possible if it moves vertically. This vertical distance is referred to as height. <u>This is the main reason why we require height in the P.E formula and calculations.</u>

The derivation of this formula is as follows:

Work = Force * Displacement

For gravitational potential energy:

Work = P.E

Force = Weight = mg

Displacement = Vertical Displacement = Height = h

Therefore,

P.E = mgh

5 0
3 years ago
3. A crew team rows a boat at a rate of 20 km/h in still water. Beginning at time = 0 minutes, the team rows for 30 minutes up a
Sindrei [870]
Going upstream against the current gives a net speed equivalent to the speed at still water minus the speed of the current. Consequently, the speed downstream gives a net speed equal to the speed at still water plus the speed of the current, making it travel faster. The solution is:

UPSTREAM

v = 20 - 1.5 = 18.5 km/h
t = 30 mins or 0.5 hours
distance = 18.5km/h (0.5 h) = 9.25 km

DOWNSTREAM
for the same distance of 9.25 km:

v = 20 + 1.5 = 21.5 km/h
t = 9.25km / 21.5 km/h = 0.43 hours or 25.8 mins  =  26 mins --> FINAL ANS.
4 0
3 years ago
Read 2 more answers
Suppose all the people of the Earth go to the North Pole and, on a signal, all jump straight up. Estimate the recoil speed of th
Makovka662 [10]

Explanation:

It is known that relation between velocity and height is as follows.

              v = \sqrt{2gh}

where,     g = acceleration due to gravity = 9.8 m/s^{2}

                h = height = 0.2 m

Therefore, velocity is calculated as follows.

            v = \sqrt{2gh}

               = \sqrt{2 \times 9.8 \times 0.2}

               = 3.92 m/s

Also,

      m_{people}v_{people} = m_{earth}v_{earth}

    v_{earth} = \frac{m_{people}v_{people}}{m_{earth}}

Putting the given values into the above formula as follows.

     v_{earth} = \frac{m_{people}v_{people}}{m_{earth}}

                = \frac{6 \times 10^{9} \times 74 kg/person}{6 \times 10^{24} kg}

                = \frac{444 \times 10^{9}}{6 \times 10^{24}}

                = 74 \times 10^{-15} m/s

or,             = 7.4 \times 10^{-14} m/s

Thus, we can conclude that recoil speed of the Earth is 7.4 \times 10^{-14} m/s.

4 0
3 years ago
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